Investigation of the structure-luminescence relationship in ZnAlEu layered double hydroxides intercalated with nitrate and benzenecarboxylates

Eu3+ doped ZnAl layered double hydroxides as calibrationless, fluorescent sensors for carbonate

“…For LDH-NO 3 , this additional oxygen coordination is likely to belong to coordination water, as already reported elsewhere. [25][26][27] For LDH-CO 3 , a different origin is more likely, based on the much longer (Eu 3+ ) 5 D 0 -7 F 2 luminescence decay lifetime (t) observed for this sample as compared to LDH-NO 3 (see Fig. 2B).…”

“…10,[23][24][25] Introduction of trivalent europium (Eu 3+ ) in the hydroxide layers of LDHs produces luminescent LDH phases whose PL depend on the anionic spacer. [25][26][27] At the same time, the anions in LDHs are exchangeable based on their affinity to the LDH host, carbonate (CO 3 2À ) standing high in the LDH affinity series. [28][29][30] The combination of high affinity to carbonate and the anion dependent PL of LDHs can then turn these materials into a class of high affinity, calibrationless carbonate sensors with potential application for the in situ, nondestructive assessment of the evolution of the carbonation front in reinforced concrete.…”

“…25 Further, analysis of Eu L IIIedge EXAFS data confirms the successful incorporation of Eu 3+ in the hydroxide layers of these LDHs in replacement of Al 3+ . [25][26][27] For the present work, nitrate intercalated Eu 3+ -doped Zn 2+ /Al 3+ LDHs (LDH-NO 3 À ) were prepared by coprecipitation of Zn 2+ , Al 3+ and Eu 3+ at constant pH (see ESI †). This procedure successfully yields pristine NO 3 À -intercalated LDHs with a characteristic basal distance of 8.6 Å, as revealed by the average between the interplanar distances calculated for the (003) and (006) Bragg reflections observed at, respectively, 10.41 and 20.41 2y in their PXRD pattern (Fig.…”

Mesostructuring layered materials: self-supported mesoporous layered double hydroxide nanotubes

“…Such rare-earth cations, e.g. Eu 3+ , have also been successfully incorporated in the hydroxide layers of LDHs, retaining an 8-fold coordination [33][34][35] . Doping trivalent rare earth elements (RE 3+ ) into LDH sheets could provide opportunities to allow the curvature of LDH hydroxide layers and enable a soft templating strategy 36 involving self-assembly of the hydroxide sheets onto convex soft-template surfaces.…”

A class of novel luminescent layered double hydroxide nanotubes

“…Inclusion of this nonoctahedral site in the LDH structure enabled the curvature of the LDH sheets, unlocking the possibility of using a sotemplating strategy to produce a class of novel hierarchical LDH nanotubes. [28][29][30][31] Pluronic® P-123 worm-like micelles were used as structure directing agents. Among the lanthanides, La 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ and Tb 3+ were observed to induce the formation of the nanotubes.…”